System and method for detecting and protecting against malicious

摘要

The invention relates to computer security and to systems and methods for detecting and protecting against malicious content such as computer viruses. Gateway (200) and security (400) computers for protecting a client computer (300) against dynamically generated malicious content. The gateway computer includes: a receiver configured to receive original content, the original content including a call to an original function, the call including an associated input. The gateway computer further includes: a content modifier unit configured to modify the original content to produce modified content, wherein the modified content includes at least a portion of the original content and a call to a shielding function, the shielding function being operable to cause the client computer to transmit an instruction to a security computer (400) to inspect the input associated with the call to the original function. The gateway computer further includes: a transmitter configured to transmit the original content to the security computer and to transmit the modified content to the client computer, thereby allowing, based on the original content, detection of dynamically generated malicious content.